CN112633041A - Fingerprint sensing device and method - Google Patents
Fingerprint sensing device and method Download PDFInfo
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- CN112633041A CN112633041A CN201910948271.2A CN201910948271A CN112633041A CN 112633041 A CN112633041 A CN 112633041A CN 201910948271 A CN201910948271 A CN 201910948271A CN 112633041 A CN112633041 A CN 112633041A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1335—Combining adjacent partial images (e.g. slices) to create a composite input or reference pattern; Tracking a sweeping finger movement
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/50—Maintenance of biometric data or enrolment thereof
Abstract
A fingerprint sensing device and method. The fingerprint sensing device includes a non-contact fingerprint sensor, a contact fingerprint sensor, and an image processing circuit. The non-contact fingerprint sensor captures a fingerprint of a target object to obtain a first fingerprint image under the condition that the target object does not contact the fingerprint sensing device. The contact type fingerprint sensor captures a fingerprint of the target object under the condition that the target object contacts the fingerprint sensing device to obtain a second fingerprint image. The image processing circuit is coupled with the non-contact fingerprint sensor and the contact fingerprint sensor to receive the first fingerprint image and the second fingerprint image. The image processing circuit stitches the first fingerprint image and the second fingerprint image to obtain a fingerprint template.
Description
Technical Field
The present invention relates to an electronic device, and more particularly, to a fingerprint sensing device and method.
Background
The area of the fingerprint sensor is typically smaller than the finger. In the process of fingerprint acquisition and registration, an application program acquires a plurality of fingerprint images by acquiring a fingerprint by the same fingerprint sensor in a segmented mode, and then stitches the fingerprint images to acquire a fingerprint template. This prior art technique has some disadvantages because these fingerprint images are all part of the entire fingerprint. For example, a completed stitched fingerprint template may still be fragmented.
In addition, the fingerprint images captured by the same fingerprint sensor may be captured from different fingerprints (different fingers). In the case where the application program has no way to determine whether the fingerprint images belong to the same fingerprint, multiple fingerprint images from different fingerprints (different fingers) may be stitched to the same fingerprint template. Generally, the same fingerprint template should not contain multi-finger fingerprint features.
It is noted that the contents of the background section are provided to aid in understanding the invention. Some (or all) of the disclosure in the background section may not be prior art as known to those of skill in the art. The statements in this background section do not imply that these statements are in the prior art to the present application and are in no way exhaustive or should be construed to limit the present disclosure.
Disclosure of Invention
The invention provides a fingerprint sensing device and a method thereof for generating a fingerprint template.
A fingerprint sensing device of the present invention includes a first contactless fingerprint sensor (touchless fingerprint sensor), a contact-type fingerprint sensor (contact-type fingerprint sensor), and an image processing circuit. The first contactless fingerprint sensor is configured to capture a fingerprint of a target object to obtain a first fingerprint image if the target object is in proximity to, but not touching, the fingerprint sensing device. The contact fingerprint sensor is configured to capture a fingerprint of a target object to obtain a second fingerprint image if the target object contacts the fingerprint sensing device. The image processing circuit is coupled with the first non-contact fingerprint sensor and the contact fingerprint sensor to receive the first fingerprint image and the second fingerprint image. The image processing circuit is configured to stitch the first fingerprint image with the second fingerprint image to obtain a fingerprint template.
A fingerprint sensing method of the present invention includes: under the condition that the target object is close to but not contacted with the fingerprint sensing device, a first non-contact fingerprint sensor of the fingerprint sensing device captures a fingerprint of the target object to obtain a first fingerprint image; under the condition that the target object contacts the fingerprint sensing device, a contact type fingerprint sensor of the fingerprint sensing device captures the fingerprint of the target object to obtain a second fingerprint image; and stitching the first fingerprint image and the second fingerprint image to obtain the fingerprint template.
In view of the above, the fingerprint sensing apparatus and method according to the embodiments of the present invention use both the non-contact fingerprint sensor and the contact fingerprint sensor to capture the same fingerprint, so as to obtain a plurality of fingerprint images. In detail, in the case that the object is close to but not touching the fingerprint sensing device, the non-contact fingerprint sensor may capture the fingerprint of the object to obtain the first fingerprint image. In the case that the object contacts the fingerprint sensing device, the contact fingerprint sensor may capture the fingerprint of the object to obtain a second fingerprint image. The first fingerprint image may contain more area (even the entire area) of the fingerprint than the second fingerprint image because the target object has not yet contacted the fingerprint sensing device. The second fingerprint image has a higher resolution (more fingerprint details) than the first fingerprint image. The fingerprint sensing device may stitch the first fingerprint image and the second fingerprint image to generate a fingerprint template. Based on the first fingerprint image with more fingerprint areas, multiple fingerprint images of different fingerprints (different fingers) can be prevented from being stitched to the same fingerprint template.
Drawings
Fig. 1 is a schematic circuit block diagram of a fingerprint sensing device according to an embodiment of the invention.
Fig. 2 is a flowchart illustrating a fingerprint sensing method according to an embodiment of the invention.
Fig. 3 is a flowchart illustrating a fingerprint sensing method according to another embodiment of the present invention.
Fig. 4 is a schematic circuit block diagram of a fingerprint sensing device according to another embodiment of the present invention.
Fig. 5 is a schematic circuit block diagram of a fingerprint sensing device according to another embodiment of the present invention.
FIG. 6 is a diagram illustrating a situation where different non-contact fingerprint sensors capture/shoot fingerprints of the same object according to an embodiment of the invention.
FIG. 7 is a diagram illustrating a situation where different contactless fingerprint sensors capture/shoot the same fingerprint at different times according to an embodiment of the invention.
Fig. 8 is a flowchart illustrating a fingerprint sensing method according to another embodiment of the present invention.
Wherein:
100. 400 and 500: a fingerprint sensing device;
110. 410, 430, 440, 450, 510, 530, 540, 550: a non-contact fingerprint sensor;
111. 121: a fingerprint image;
120. 420, 520: a contact fingerprint sensor;
130: an image processing circuit;
511. 531, 541, 551: a fingerprint image;
710: a finger;
711: a fingerprint;
h: a distance;
s210 to S230, S310 to S330, S810 to S850: a step of;
T0: a first time;
T1: a second time;
T2: a third time;
T3: and a fourth time.
Detailed Description
In order to make the features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The term "coupled" as used throughout this specification may refer to any means for connecting, directly or indirectly. For example, if a first device couples (or connects) to a second device, it should be construed that the first device may be directly connected to the second device or the first device may be indirectly connected to the second device through other devices or some means of connection. The terms "first," "second," and the like, as used throughout this specification are used to designate elements (elements) that are common names or to distinguish between different embodiments or ranges, and are not used to limit the number of elements, nor the order of the elements. Further, wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts. Components/parts/steps in different embodiments using the same reference numerals or using the same terms may be referred to one another in relation to the description.
Fig. 1 is a schematic circuit block diagram of a fingerprint sensing device 100 according to an embodiment of the invention. The fingerprint sensing device 100 includes a contactless fingerprint sensor (touch-type fingerprint sensor)110, a contact-type fingerprint sensor (contact-type fingerprint sensor)120, and an image processing circuit 130. The contactless fingerprint sensor 110 is arranged on one side of the contact fingerprint sensor 120. When the fingerprint sensing device 100 performs fingerprint sensing on a certain object (e.g., a finger), both the non-contact fingerprint sensor 110 and the contact fingerprint sensor 120 can capture fingerprint images of the same object.
The non-contact fingerprint sensor 110 may be an optical fingerprint sensor or other type of fingerprint sensor, depending on design requirements. In the case where an object (e.g., a finger) is close to but not touching the fingerprint sensing device 100, i.e., the object is close to but not yet touching the contactless fingerprint sensor 110, the contactless fingerprint sensor 110 can capture the fingerprint of the object to obtain the fingerprint image 111.
The contact fingerprint sensor 120 may be an optical fingerprint sensor, a capacitive fingerprint sensor, an ultrasonic fingerprint sensor, or other types of fingerprint sensors, depending on design requirements. In the case where an object (e.g., a finger) contacts the fingerprint sensing device 100, i.e., in the case where the object contacts the contact fingerprint sensor 120, the contact fingerprint sensor 120 can capture a fingerprint of the object to obtain a fingerprint image 121.
The image processing circuit 130 is coupled to the contactless fingerprint sensor 110 and the contact fingerprint sensor 120 to receive the first fingerprint image 111 and the second fingerprint image 121. The image processing circuit 130 may stitch the fingerprint image 111 with the fingerprint image 121 to obtain a fingerprint template. The present embodiment does not limit the image stitching details performed by the image processing circuit 130 on these fingerprint images. For example, based on some design requirements, the image processing circuit 130 may execute an existing image stitching algorithm or other algorithms to facilitate image stitching of the fingerprint image 111 and the fingerprint image 121.
The contactless fingerprint sensor 110 and the contact fingerprint sensor 120 can capture the same fingerprint to obtain the fingerprint image 111 and the fingerprint image 121. In comparison to the fingerprint image 121, the fingerprint image 111 may include more area (even the entire area) of the fingerprint because the object (e.g., a finger) is close but not touching the fingerprint sensing device 100. For example, the fingerprint image 111 includes part or all of the fingerprint image 121. The fingerprint image 121 has a higher resolution (more fingerprint details) than the fingerprint image 111. The image processing circuit 130 may stitch the fingerprint image 111 with the fingerprint image 121 to generate a fingerprint template. Based on the first fingerprint image 111 with more fingerprint areas, multiple fingerprint images of different fingerprints (different fingers) can be stitched to the same fingerprint template while avoiding faces.
Fig. 2 is a flowchart illustrating a fingerprint sensing method according to an embodiment of the invention. Please refer to fig. 1 and fig. 2. In the case where an object (e.g., a finger) is close to but not touching the fingerprint sensing device 100 (e.g., before the object touches the fingerprint sensing device 100), the non-contact fingerprint sensor 110 of the fingerprint sensing device 100 can capture a fingerprint of the object to obtain a fingerprint image 111 (step S210). In the case that the object contacts the fingerprint sensing device 100, the contact fingerprint sensor 120 of the fingerprint sensing device 100 can capture the fingerprint of the object to obtain the fingerprint image 121 (step S220). In step S230, the image processing circuit 130 of the fingerprint sensing device 100 may stitch the fingerprint image 111 and the fingerprint image 121 to obtain a fingerprint template.
Fig. 3 is a flowchart illustrating a fingerprint sensing method according to another embodiment of the present invention. Please refer to fig. 1 and fig. 3. In the case that an object (e.g., a finger) contacts the fingerprint sensing device 100, the contact fingerprint sensor 120 of the fingerprint sensing device 100 can capture a fingerprint of the object to obtain a fingerprint image 121 (step S310). During the process of the object leaving the fingerprint sensing device 100, the non-contact fingerprint sensor 110 of the fingerprint sensing device 100 can capture the fingerprint of the object to obtain the fingerprint image 111 (step S320). In step S330, the image processing circuit 130 of the fingerprint sensing device 100 may stitch the fingerprint image 111 and the fingerprint image 121 to obtain a fingerprint template.
It should be noted that the number of non-contact fingerprint sensors and the number of contact fingerprint sensors should not be limited to the example shown in fig. 1. The number of non-contact fingerprint sensors and the number of contact fingerprint sensors may be determined according to design requirements.
Fig. 4 is a block diagram of a fingerprint sensing device 400 according to another embodiment of the present invention. The fingerprint sensing device 400 shown in FIG. 4 includes a non-contact fingerprint sensor 410, a contact fingerprint sensor 420, a non-contact fingerprint sensor 430, a non-contact fingerprint sensor 440, a non-contact fingerprint sensor 450, and an image processing circuit (not shown, and so on with reference to the related description of the image processing circuit 130 shown in FIG. 1). The contactless fingerprint sensors 410, 430, 440, and 450 shown in FIG. 4 can be analogized with reference to the contactless fingerprint sensor 110 shown in FIG. 1, and the contact fingerprint sensor 420 shown in FIG. 4 can be analogized with reference to the contactless fingerprint sensor 120 shown in FIG. 1, so that the descriptions thereof are omitted.
As shown in fig. 4, the contactless fingerprint sensor 410 and the contactless fingerprint sensor 430 are arranged on different sides (opposite sides) of the contact fingerprint sensor 420, respectively, and the contactless fingerprint sensor 440 and the contactless fingerprint sensor 450 are arranged on different sides (opposite sides) of the contact fingerprint sensor 420, respectively. In the case where an object (e.g., a finger) is close to but not touching the fingerprint sensing device 400, the non-contact fingerprint sensors 410, 430, 440, and 450 may capture/capture a fingerprint of the object at the same time (or at different times) to obtain/generate a fingerprint image. An image processing circuit (not shown) is coupled to the contactless fingerprint sensors 410, 430, 440 and 450 to receive fingerprint images. The image processing circuit may stitch the fingerprint images of the contactless fingerprint sensors 410, 430, 440, and 450 to obtain a fingerprint template.
Fig. 5 is a schematic circuit block diagram of a fingerprint sensing device 500 according to yet another embodiment of the present invention. The fingerprint sensing device 500 shown in FIG. 5 includes a non-contact fingerprint sensor 510, a contact fingerprint sensor 520, a non-contact fingerprint sensor 530, a non-contact fingerprint sensor 540, a non-contact fingerprint sensor 550, and an image processing circuit (not shown, and so on with reference to the related description of the image processing circuit 130 shown in FIG. 1). The contactless fingerprint sensors 510, 530, 540, and 550 shown in FIG. 5 can be analogized with reference to the contactless fingerprint sensor 110 shown in FIG. 1, and the contact fingerprint sensor 520 shown in FIG. 5 can be analogized with reference to the contactless fingerprint sensor 120 shown in FIG. 1, so that the descriptions thereof are omitted.
As shown in FIG. 5, non-contact fingerprint sensor 510 and non-contact fingerprint sensor 530 are each disposed on a different side (opposite side) of contact fingerprint sensor 520, and non-contact fingerprint sensor 540 and non-contact fingerprint sensor 550 are each disposed on a different side (opposite side) of contact fingerprint sensor 520. When the fingerprint sensing device 500 performs fingerprint sensing on a target object (e.g., a finger), the non-contact fingerprint sensors 510, 530, 540, and 550 and the contact fingerprint sensor 520 can capture fingerprint images of the same target object.
For example, fig. 6 is a schematic diagram illustrating a situation in which different contactless fingerprint sensors capture/shoot fingerprints of the same object according to an embodiment of the invention. The dotted lines shown in fig. 6 indicate the photographing ranges of the non-contact fingerprint sensors 510 and 530. The contactless fingerprint sensors 540 and 550 may be analogized with reference to the description relating to the contactless fingerprint sensors 510 and 530. The distance H shown in fig. 6 represents a rated photographing distance (maximum photographing distance) of the non-contact fingerprint sensors 510, 530, 540, and 550. In the case where an object (e.g., finger 710) is close to but not touching the fingerprint sensing device 500, the non-contact fingerprint sensors 510, 530, 540 and 550 can capture/capture the fingerprint of the object at the same time (or at different times) to obtain/generate the fingerprint image.
For example, when the distance between the object (e.g., finger 710) and the fingerprint sensing device 500 is a first distance (e.g., distance H), the contactless fingerprint sensor 510 captures a fingerprint of the object to generate a fingerprint image. When the distance between the object and the fingerprint sensing device 500 is a second distance (less than the first distance, e.g., 3 × H/4), the non-contact fingerprint sensor 530 captures a fingerprint of the object to generate another fingerprint image. When the distance between the object and the fingerprint sensing device 500 is a third distance (less than the second distance, e.g., distance H/2), the non-contact fingerprint sensor 530 captures a fingerprint of the object to generate another fingerprint image. When the distance between the object and the fingerprint sensing device 500 is a fourth distance (less than the third distance, e.g., distance H/4), the non-contact fingerprint sensor 530 captures a fingerprint of the object to generate another fingerprint image.
For another example, fig. 7 is a schematic diagram illustrating a situation in which different contactless fingerprint sensors capture/shoot the same fingerprint at different times according to an embodiment of the invention. Before an object, such as a finger 710, contacts the fingerprint sensing device 500, the non-contact fingerprint sensor 510 is at a first time T0Taking a fingerprint 711 of an object to generate a fingerprint image 511, the non-contact fingerprint sensor 530 at a first time T0A second time T later1Taking a fingerprint 711 of an object to generate another fingerprint image 531, the non-contact fingerprint sensor 540 at a second time T1A third time T later2Taking a fingerprint 711 of an object to generate another fingerprint image 541, and the non-contact fingerprint sensor 550 at a third time T2A fourth time T later3A fingerprint 711 of the object is captured to generate another fingerprint image 551.
The fingerprint image 511 may contain more area (even the entire area) of the fingerprint 711 than the fingerprint images 531, 541, and 551. The fingerprint images 531, 541, and 551 have more fingerprint details than the fingerprint image 511. The image processing circuit 130 may stitch the fingerprint images 511, 531, 541, and 551 to generate a fingerprint template. Based on the first fingerprint image 511 with more fingerprint area, multiple fingerprint images of different fingerprints (different fingers) can be stitched to the same fingerprint template while avoiding faces.
In the case that the object contacts the fingerprint sensing device 500, the contact fingerprint sensor 520 may capture a fingerprint of the object to obtain a fingerprint image. An image processing circuit (not shown) is coupled to the non-contact fingerprint sensors 510, 530, 540, and 550 and the contact fingerprint sensor 520 to receive fingerprint images. The image processing circuitry may stitch the fingerprint images of the non-contact fingerprint sensors 510, 530, 540, and 550 with the fingerprint image of the contact fingerprint sensor 520 to obtain a fingerprint template.
Fig. 8 is a flowchart illustrating a fingerprint sensing method according to another embodiment of the present invention. Please refer to fig. 5 and 8. The non-contact fingerprint sensors 510, 530, 540, and 550 can detect whether a target object (e.g., a finger) is close to the fingerprint sensing device 500. When an object approaches the contact fingerprint sensor 520 from any direction, a non-contact fingerprint sensor corresponding to the direction of the object will first detect that the object is approaching and can immediately capture the fingerprint image and the size of the finger. For example, when the non-contact fingerprint sensor 510 detects a target object (step S810), the non-contact fingerprint sensor 510 of the fingerprint sensing device 500 can capture/shoot a fingerprint of the target object to obtain a fingerprint image if the target object is close to but not yet contacted with the fingerprint sensing device 500 (step S820).
In step S830, the image processing circuit (not shown, and so on with reference to the description of the image processing circuit 130 shown in fig. 1) may notify the other non-contact fingerprint sensors 530, 540, and 550, so that the non-contact fingerprint sensors 530, 540, and 550 may capture/shoot the fingerprint of the object at different times to obtain a plurality of fingerprint images. For example, based on the control of the image processing circuit, the other non-contact fingerprint sensors 530, 540 and 550 can capture fingerprint images sequentially (e.g., clockwise, counterclockwise or other sequence) until the finger touches the contact fingerprint sensor 520 and the contact fingerprint sensor 520 captures the fingerprint images.
In the case that the object contacts the fingerprint sensing device 500, the contact fingerprint sensor 520 of the fingerprint sensing device 500 can capture the fingerprint of the object to obtain a fingerprint image (step S840). In step S850, an image processing circuit (not shown, and so on with reference to the description of the image processing circuit 130 shown in fig. 1) of the fingerprint sensing device 500 may stitch the fingerprint images of the non-contact fingerprint sensors 510, 530, 540, and 550 and the fingerprint image of the contact fingerprint sensor 520 to obtain a fingerprint template.
Note that the finger size varies from person to person. If the fingerprint size can be judged during registration, the most appropriate storage space can be given according to the fingerprint size, so that the memory can be effectively used, the hardware cost is reduced, and the efficiency is improved. Since the non-contact fingerprint sensor that detects the approach of the finger at the earliest time can detect/capture the complete fingerprint, the image processing circuit can determine the size of the finger at the earliest time. Therefore, the image processing circuit can pre-judge the size of the storage space required by the fingerprint template, and further dynamically configure the memory space to store the fingerprint template, so that the use efficiency of the memory can be improved.
The implementation of the blocks of the image processing circuit may be hardware (hardware), firmware (firmware), software (software, i.e. program) or a combination of a plurality of the foregoing according to different design requirements.
In terms of hardware, the blocks of the image processing circuit may be implemented as logic circuits on an integrated circuit (integrated circuit). The related functions of the image processing circuit described above may be implemented as hardware using a hardware description language (e.g., Verilog HDL or VHDL) or other suitable programming language. For example, the related functions of the image processing circuit may be implemented in various logic blocks, modules and circuits of one or more controllers, microcontrollers, microprocessors, Application-specific integrated circuits (ASICs), Digital Signal Processors (DSPs), Field Programmable Gate Arrays (FPGAs) and/or other processing units.
In the form of software and/or firmware, the related functions of the image processing circuit can be implemented as programming codes. For example, the image processing circuit is implemented using a general programming language (e.g., C, C + + or assembly language) or other suitable programming language. The programming codes may be recorded/stored in a storage medium, such as a Read Only Memory (ROM), a storage device, and/or a Random Access Memory (RAM). A computer, a Central Processing Unit (CPU), a controller, a microcontroller, or a microprocessor can read and execute the programming codes from the recording medium to achieve the related functions. As the storage medium, a "non-transitory computer readable medium" may be used, and for example, a tape (tape), a disk (disk), a card (card), a semiconductor memory, a programmable logic circuit, or the like may be used. The program may be supplied to the computer (or CPU) via any transmission medium (communication network, broadcast wave, or the like). Such as the Internet, wired communication, wireless communication, or other communication media.
In summary, the fingerprint sensing apparatus and method according to the embodiments of the invention use the non-contact fingerprint sensor and the contact fingerprint sensor to capture the same fingerprint, so as to obtain a plurality of fingerprint images. When the finger is close to the touch-type fingerprint sensor, the touch-type fingerprint sensor can capture rough fingerprints according to the appearance size and the lines of the finger in advance so as to obtain a rough fingerprint image. The rough fingerprint image can be used as judgment information for subsequent fingerprint stitching. In detail, in the case that the object is close to but not touching the fingerprint sensing device, the non-contact fingerprint sensor may capture the fingerprint of the object to obtain the first fingerprint image. In the case that the object contacts the fingerprint sensing device, the contact fingerprint sensor may capture the fingerprint of the object to obtain a second fingerprint image. The first fingerprint image may contain more area (even the entire area) of the fingerprint than the second fingerprint image. The second fingerprint image has a higher resolution (more fingerprint details) than the first fingerprint image. The fingerprint sensing device may stitch the first fingerprint image and the second fingerprint image to generate a fingerprint template. Based on the first fingerprint image with more fingerprint areas, a plurality of fingerprint images of different fingerprints (different fingers) can be stitched to the same fingerprint template while avoiding the surface.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A fingerprint sensing device comprising:
a first non-contact fingerprint sensor configured to capture a fingerprint of an object to obtain a first fingerprint image when the object is close to but not contacting the fingerprint sensing device;
a contact fingerprint sensor configured to capture the fingerprint of the object to obtain a second fingerprint image if the object contacts the fingerprint sensing device; and
an image processing circuit coupled to the first non-contact fingerprint sensor and the contact fingerprint sensor to receive the first fingerprint image and the second fingerprint image, wherein the image processing circuit is configured to stitch the first fingerprint image and the second fingerprint image to obtain a fingerprint template.
2. The fingerprint sensing device according to claim 1, wherein said first non-contact fingerprint sensor is an optical fingerprint sensor and said contact fingerprint sensor is an optical fingerprint sensor or a capacitive fingerprint sensor.
3. The fingerprint sensing device according to claim 1, further comprising:
a second non-contact fingerprint sensor configured to capture the fingerprint of the object to obtain a third fingerprint image without the object contacting the fingerprint sensing device;
the first non-contact fingerprint sensor and the second non-contact fingerprint sensor are respectively configured on different sides of the contact fingerprint sensor, the image processing circuit is further coupled to the second non-contact fingerprint sensor to receive the third fingerprint image, and the image processing circuit stitches the first fingerprint image, the second fingerprint image and the third fingerprint image to obtain the fingerprint template.
4. The fingerprint sensing device according to claim 3, wherein said first non-contact fingerprint sensor and said second non-contact fingerprint sensor capture the fingerprint of the object simultaneously to generate the first fingerprint image and the third fingerprint image, respectively, when the object is close to but not contacting the fingerprint sensing device.
5. The fingerprint sensing device according to claim 3, wherein the first non-contact fingerprint sensor captures the fingerprint of the object at a first time to generate the first fingerprint image and the second non-contact fingerprint sensor captures the fingerprint of the object at a second time after the first time to generate the third fingerprint image before the object contacts the fingerprint sensing device.
6. The fingerprint sensing device according to claim 3,
when a distance between the object and the fingerprint sensing device is a first distance, the first non-contact fingerprint sensor shoots the fingerprint of the object to generate a first fingerprint image, and
when the distance is a second distance smaller than the first distance, the second non-contact fingerprint sensor shoots the fingerprint of the target object to generate the third fingerprint image.
7. A fingerprint sensing method, comprising:
under the condition that an object is close to but not contacted with a fingerprint sensing device, a first non-contact fingerprint sensor of the fingerprint sensing device captures a fingerprint of the object to obtain a first fingerprint image;
under the condition that the target object contacts the fingerprint sensing device, a contact type fingerprint sensor of the fingerprint sensing device captures the fingerprint of the target object to obtain a second fingerprint image; and
and stitching the first fingerprint image and the second fingerprint image to obtain a fingerprint template.
8. The fingerprint sensing method of claim 7, further comprising:
under the condition that the target object is close to but not contacted with the fingerprint sensing device, a second non-contact fingerprint sensor captures the fingerprint of the target object to obtain a third fingerprint image; and
stitching the first fingerprint image, the second fingerprint image and the third fingerprint image to obtain the fingerprint template;
wherein the first contactless fingerprint sensor and the second contactless fingerprint sensor are arranged on different sides of the contact fingerprint sensor, respectively.
9. The fingerprint sensing method according to claim 8, wherein said first non-contact fingerprint sensor and said second non-contact fingerprint sensor capture said object simultaneously to generate said first fingerprint image and said third fingerprint image, respectively, when said object is close to but not contacting said fingerprint sensing device.
10. The fingerprint sensing method of claim 8, wherein the first contactless fingerprint sensor captures the object at a first time to generate the first fingerprint image and the second contactless fingerprint sensor captures the object at a second time after the first time to generate the third fingerprint image before the object contacts the fingerprint sensing device.
11. The fingerprint sensing method according to claim 8,
when a distance between the object and the fingerprint sensing device is a first distance, the first non-contact fingerprint sensor shoots the fingerprint of the object to generate a first fingerprint image, and
when the distance is a second distance smaller than the first distance, the second non-contact fingerprint sensor shoots the fingerprint of the target object to generate the third fingerprint image.
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| CN201910948271.2A CN112633041A (en) | 2019-10-08 | 2019-10-08 | Fingerprint sensing device and method |
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| CN201910948271.2A CN112633041A (en) | 2019-10-08 | 2019-10-08 | Fingerprint sensing device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20170039410A1 (en) * | 2014-09-26 | 2017-02-09 | Shenzhen Huiding Technology Co., Ltd. | Fingerprint sensors |
| CN106778461A (en) * | 2016-03-17 | 2017-05-31 | 深圳信炜科技有限公司 | Finger prints processing method, finger prints processing device, fingerprint recognition system and electronic equipment |
| CN107580709A (en) * | 2015-06-18 | 2018-01-12 | 深圳市汇顶科技股份有限公司 | Multifunctional fingerprint sensor with optical sensor ability |
| CN109154959A (en) * | 2017-05-17 | 2019-01-04 | 深圳市汇顶科技股份有限公司 | Optical fingerprint sensor with non-contact imaging capability |
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2019
- 2019-10-08 CN CN201910948271.2A patent/CN112633041A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170039410A1 (en) * | 2014-09-26 | 2017-02-09 | Shenzhen Huiding Technology Co., Ltd. | Fingerprint sensors |
| CN107580709A (en) * | 2015-06-18 | 2018-01-12 | 深圳市汇顶科技股份有限公司 | Multifunctional fingerprint sensor with optical sensor ability |
| CN106778461A (en) * | 2016-03-17 | 2017-05-31 | 深圳信炜科技有限公司 | Finger prints processing method, finger prints processing device, fingerprint recognition system and electronic equipment |
| CN109154959A (en) * | 2017-05-17 | 2019-01-04 | 深圳市汇顶科技股份有限公司 | Optical fingerprint sensor with non-contact imaging capability |
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